Coke oven door with sealing diaphragm



Nov. 5, 1957 l se so L. G. TUCKERJR i COKE OVEN DooR WITH sEALmGA DIAPHRAGM Filed Dec. 13.1952

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` COKE OVEN DOOR WITH SEALING D'IAPHRAGM Filed Deo. 13, 1952 5 Sheets-Sheet 5 rn/wooo 6.750051?,

United States Patent 2,812,292 Patented NovLS, i957 COKE OVEN DOR WITH SEALING DIAIHRAGM Linwood G. Tucker, Jr., Pittsburgh, Pa., assignor to Kappers Company, Inc., a corporation of Delaware Application December 13, 1952, Serial No. 325,807 1s Claims. (ci. 2oz-24s) This invention relates to coke oven doors of the selfsealing type for closing the ends of coking chambers of horizontal coke ovens.

As usually constructed each of the coking chambers in a battery of coke ovens is surrounded at each end by a metallic jamb frame having an opening therethrough which is surrounded by a substantially flat sealing surface. A door is detachably secured to the jamb frame and is provided with a flexible metal sealing member having a narrow sealing edge which is adapted to engage the sealing surface on the jamb frame throughout the circumference of the sealing surface, The sealing edge on the door is held in engagement with the sealing surface on the jamb frame by the inherent resiliency of the material of which the sealing member is constructed, while spring pressed plungers are sometimes employed to provide additional force to press the sealing edge on the sealing member against the sealing surface `on the jamb frame.

It is well known that coke oven chambers are maintained at relatively high temperatures, on the order of 2,100 F. The jamb frames engage the refractory structure of the oven battery, while the inner face of a door is exposed to the high temperatures in a coking chamber. The outer faces of the door and jamb frame are exposed to the atmosphere, and therefore, are at much lower temperatures than the inner faces of these members which are exposed to the high temperatures of a coking chamber. Because of the unequal heating of the inner and outer faces of the door and jamb frame, the inner portion of the door and jamb frame expand more than the outer portions, with the result that the door and the jamb frame develop a slight curvature, the convex faces being towards the oven chamber and the concave faces being on the exposed surfaces. lThis curvature of the door and jamb frame has made it dicult to secure effective, gastight engagement of the sealing edge on the sealing member with the sealing surface on the jamb frame throughout the circumference of this sealing surface.

The present invention avoids these and other disadvantages by providing an improved door of the self-sealing type.

One feature of the invention is to provide an improved door which is arranged to insure that the sealing edge on the door engages the sealing surface on the jamb frame throughout the circumference of the jamb frame even though the jamb frame is warped or curved.

Another feature of the invention is to provide an improved door which incorporates means to cause thesealing edge on the door to conform to the sealing surface on the jamb frame even though the jamb frame is curved.

A further feature of the invention is to provide an improved door which is arranged so that the force to press the sealing edge member against the sealing surface on the jamb frame is exerted at points spaced apart vertically in such manner that the portions of the sealing edge member adjacent the mid-portion of the door are deflected more than the portions of the sealing edge member adjacent the top and bottom of the door.

Another' feature of the invention is to provide an improved door which is arranged so that the latch bars exert force on the sealing edge member through a member which is graduated as to flexibility so that the portions of the sealing edge member adjacent the mid-portion of the door may be deflected more than the portions of the sealing edge member adjacent the top and bottom of the door.

A further feature of the invention is to provide an improved door which eliminates the need for spring pressed plungers to press the sealing edge member against the jamb frame.

Another feature of the invention is to provide an improved door the major portions of which can be formed of rolled steel.

A further feature of the invention is to provide an improved door of the type described which is arranged so that when the latch bars are tightened to press the door against the door frame, force `is exerted on the sealing edge portions of the door along the sides of the door to deflect these sealing edge portions as required to insure that they tightly engage the sealing surface on the jamb frame throughout the length of the jamb frame, even though the sealing surface on the jamb frame is curved because the jamb frame has been warped by unequal temperature conditions on the inner and outer faces thereof.

Another feature of the invention is to provide an improved door of thetype described which is arrangedso.

thatthe sealing edge is carried by a relatively heavy yieldable member extending around the periphery of the A further feature of the invention is to provide an irnproved door of the type described in which the area Within the yieldable member is closed by a plate on which the refractory plug is secured and the marginal portions of which are connected with the yieldable member through a flexible metal diaphragm of substantial Width.

Another modification of the invention is to provide an improved door of the type described which includes a flexible bordermember extending around the periphery of the door, a plate positioned within the border member and having the refractory plug secured to a face thereof, and a flexible sealing diaphragm extending between the plate and the border member, together with means for limiting movement of the plate and the border member relative to each other to an amount which will not injure the diaphragm.

Another feature of the invention is to provide an irnproved `door of the type described which when adapted to the pusher side of the coking chamber has a conventional leveller bar chuck door arrangement that operates simply and eficiently.

Another modification of the invention is to provide an improved door of the type described which may readily be adapted with various types of latch means for exerting force on the door sealing member.

A further feature of the invention is to provide an irnproved door of the type described which is arranged in such manner that the door can be constructed and assemt Other objects of the invention and features of novelty will be 'apparent from the following description taken in connection with the accompanying drawings in which:

Fig 1 is an elevational view of the end of an oven chamber equipped with a door embodying my invention,

Fig, 2 is a sectional view taken substantially along the line II-I of Fig. 1,

Fig. 3 is an enlarged sectional View taken substantially along the line III-III of Fig. l,

Fig. 4 is a fragmentary enlarged sectional View taken substantially along the line IV--IV of Fig. 1, and

Fig'. 5 is a fragmentary enlarged sectional View showing details of construction of the sealing diaphragm and associated parts,

Fig". 6 is an elevational view of the pusher side of l*an oven chamber equipped with a door embodying my invention and having a chuck door adapted thereto,

Y Figrl'y is; asectional view taken substantially along the line VIII- VII of lFig.` 6, l a a Fig. 8 is a sectional view taken substantially along the line VIII- VIII of Fig. 6. l

In practicing the invention, there is formed a substantially rectangular frame shaped border member having an opening disposed therein from a strip of relatively heavy rolled `steel plate, the strip being substantially wider than it is thick and being formedvin the border member in such manner that the edges ofthe strip are on the inner and outer faces of the door. The strip from which the border member is constructed is of such form that the face of the border member on the inner face of the door is in the saine plane throughout the circumference of the door. The strip Vis of varying width so that different portions of the border member have different degrees of flexibility, and so that when the door has been tightened against a jamb frame and the border member isAdeected to conform to curvature of the jamb frame, the stresses in the border member will be substantially uniformly distrib-l uted. Thestrip from which the border member is formed is also of such proportions that the` stresses therein will be so small that the elastic limits of the material of the border member will not be exceeded with the result that the border-member will resume its original shape as soon as force ceases to be exerted on it.

A sealing edge member is secured to the border member and projects from the inner face of the border member. The sealing edge member extends completely around the circumference Iof the border member and its projecting lportion* tapers to a relatively narrow exposed edge which is adapted to be pressed against the sealing surface on a jamb frame.

flhe area or opening enclosed bythe border member isvclosed in part by a steel clamping plate spaced therefrom, the clamping plate being of substantially the saine shape 'as this area and aligned therewith. j The clamping platehas secured thereto the refractory plug which projects from the inner face of the door. A 'flexible metal diaphragm'of substantial width has its inner edge secured to the louter edge of the clamping plate, and has its outer edge secured to the border member, to provide a seal between the clamping plate and the border `member and at the same time permit the border member to ex or move relative to the clamping plate.

The lborder member has secured to its upper end a hook which is adapted to engage aprojection adjacent the top of the door frame to support the doorfom lthe jamb Vframe during installation and'r'emov'al Iof the door;

ber on which a latch bar is secured. The arrangement of the l S Silh thf v/'heli the latch bls are tightened, force is first exerted through each arm on the border member to press the end of a side of the border member toward the jamb frame, and to thereafter press the midportion of a side of the border member toward the jamb frame so that the sides of theborder member are caused to adapt themselves to the jamb frame. The operation of the yoke assemblies is such that a predetermined proportion of the force exerted by the latch bars to press the door toward the jamb frame is exerted on the corner portions of the door to thereby insure that the sealing edge member in the vicinity of the corners of the door firmly engages the sealing surface on the 'jamb frame.

The ends of the arms of the yoke assemblies are connected together by other cross members to which the clamping plate is secured so that the clamping plate, which carries the refractory plug, is connected vto the border member through the yoke assemblies.

The clamping plate is rigidly secured to one of the cross members, but is attached to the remaining cross members in such manner as to permit limited movement of 'the clamping plate relative to the cross members, and

thus prevent objectional bending of the clamping plate through the flexing of the border member, and to also perinit the clamping plate to freely adjust itself relative to ythe border member as required because of Variations in temperature conditions.

Referring to Figs. 1 and 2 of the drawings there is shown in position on a jamb frame at the end of a coking chamber a door embodying this invention. The door illustrated is for the coke side of an oven battery so that it is unnecessary to provide a door or opening for the leveler bar. a Y

The c'oking chamber 10 has walls 1'1 formed of refractory brick, and as is usual and customary, each oven chamber in an oven battery is a long narrow, rectangular chamber which is surrounded at each end by a metallic jamb frame of the type shown and indicated generally by Vthe reference numeral 1'2. Each jamb frame 12 is a metal vcasting in the form of a hollow rectangle having a central opening of ysubstantially the sizeof an oven chamber and located substantially in alignment with an oven chamber.

Referring to Fig. 3, each jamb lframe 12 has adjacent its inner 'margin a substantially hat portion 14 having on the face of the jamb 'frame remote from the oven battery a 'flat sealing surface 15, which extends completely around the opening through the jamb frame. As hereinafter explained, the sealing surface 15 is adapted `to be .engaged by the narrow sealing edge ory face on a flexible :sealing edge member 26 carried by a door. The jamb frame 12 i's in the-form of a heavy steel casting and the .sealing surface 'I5 is machined on this casting yso that at the time the jamb Vframe is constructed and installed, .the surface 15 is substantially flat and all portions of the surface throughout the circumference of the .jamb frame are in the-same plane. Y

Each jamb lframe 12 has outwardly of the flat portion 14 a flange 16 which extends completely around the jamb frame, 'the portions of this flange lalong the sides `and top of the jamb frame extending substantially perpendicular to the flat portion 14, as shown in IFig. Zand 3, while the portion of the flange ..16 across the bottom of the jamb frame extends atan angle, vas shown in Fig. 2, so that material .pushed from an oven chamber will `not remain on the j amb fframe.

Referring to Fig. 3, each ljarrib Yframe has on each .side outwardly "of the V'flange ,'16, a Vflat outwardly projecting flange '17 which extendsth'roughout'the length of a side ofthe jamb frame and 'is adaptedto b'eengaged by 'the inner vface 'of abuck stay '18 Iwh'i'chisin Vthe form of an Ibea'm extending vertically along -the face of the oven battery. r a

yThe 'refractory 'shapes forming Vthe 'walls I1 of the oven chambers are recessed to receive the ange portion 414 of the jamb frame 12, while compressible packing material 13, such as asbestos rope, is clamped between the jamb frame 12 and the refractory shapes to prevent escape of gas between the jamb frame and the refractory shapes.

The construction of the jamb frame 12, with the deep ange 16 extending completely around the jamb frame, and with the anges 17 on the sides engaged by the buck stays 15, is such that the jamb frame is relatively rigid and will withstand substantial forces. However, the inner face of the jamb frame either directly engages the refractory shapes of the oven battery or is closely adjacent thereto, while the outer face of the jamb frame is exposed to the atmosphere. It is well known that the refractory portion of an oven battery is maintained at an extremely high temperature, on the order of 2,l F. Although the portions of the refractory structure im mediately adjacent the jamb frames are not at this temperature level, they are hot enough to cause the inner face of the jamb frames to be much hotter thanv the outer faces of the jamb frames. Similarly, the inner faces of the buck stays 18 are much hotter than the outer faces.

lt is well known that most metals expand when heated, and that the amount of expansion is substantially in accordance with the increase in temperature. As the inner faces of the jamb frames are heated much more than the outer faces, the inner portions of the jamb frames expand more than the outer portions with the result that the frames may become curved with the concave side on the outer face of the jamb frames. Since the jamb frames are relatively narrow, the amount of curvature across the top and bottom of a jamb frame is relatively small, but as the jamb frames are quite long, the amount of curvature along the sides of a jamb frame may be substantial.

As is best shown in Fig. 2 of the drawings, the upper end of the jamb frame 12 has formed on the outer face thereof between the sealing surface and the flange 16, a projection or ledge 19 which is adapted to be engaged by the hook on the upper end of a door to support the door during installation and removal.

Referring to Fig. 3, the jamb frame has secured to each side thereof two iatch or hook plates 2t) which project from the outer face of the door and have recesses therein which are adapted to receive the ends of latch bars carried by a door. The latch plates 20 are located on the inner faces of the flange 16 and are secured to the flange by rivets or equivalent means.

The jamb frame heretofore described is of standard construction and the door provided by this invention is adapted to be employed withrthis jamb frame. Y

The door provided by this invention is of such size as to fit within the flange 16 on the jamb frame. The door has a border member indicated generally by the reference numeral 2l and formed of rolled steel plate of suitable thickness, such as one and one-half inches. The border member 2l extends completely around the door and is of such size and configuration that when the door is in position on a jamb frame the plane of the outer side faces of the border member is substantially in alignment with the middle of the sealing surface 15 on the jamb frame (Fig. 3).

As is clearly shown in Fig. 2, by the solid and broken lines, one edge of the strip of steel plate from which the border member 21 is formed is substantially straight, this edge being at the inner face of the door, while the other edge of this strip is irregular so that different portions of the border member are of diiferent'widths and therefore of different degrees of flexibility.

The strip forming the border member 21 may be fabricated by joining two or more pieces together by welding. In a preferred embodiment, the border member 21 is built up from two sections or pieces each of which extends throughout a side of the door andV across one-half of the top and bottomendof the door, the Aconfronting d ends of the two pieces being secured together by Welding so that the seams are located substantially at the middle of the top and bottom of the door.

The portions of the strip forming the border member and extending across the top and bottom of the door, and also around the corners of the door and for a short distance along the sides of the door, are relatively wide, on the order of seven inches. As is clearly shown in Fig. 2, the strip adjacent these end portions abruptly decreases in width to about four and one-half inches (broken lines), this width being reached about ten inches from the upper and lower ends of the border member. The four and onehalf inch width continues from each end of each side of the border member toward the middle of the border member side for a distance of about three feet. The strip from which the border member is formed thereafter increases in width toward the center of each side member so that at the middle of each side member the strip is about seven inches wide (solid line). It will be realized that these dimensions can vary when different materials are used in the construction of the border member.

Referring to Fig. 3, the border member 21 has secured to the side faces thereof guide members 22 which are located along the sides of the door at points such that when the door is in position in the jamb frame, the guide members 22 are opposite the hook plates 2d. The guide members 22 are of such thickness that the door can pass between two hook plates with a small amount of clearance, while the exposed faces of the guide members 22 are tapered or sloping so the portions of the guide members adjacent the inner face of the door are thinner than the other portions of these members. Similarly, the confronting faces of the hook plates 2b are tapered at their outer ends as indicated at 23. The tapered faces on the guide members 22 and on the latch plates 20 cooperate to locate `the door and guide the door between the flanges i6 during installation of the door.

The border member 21 has a recess 25 cut in the peripherally outer face thereof. The recess 25 is located at the edge of the border member nearest the inner face of the door and extends completely around the door. The recess 25 is adapted to receive the sealing edge member 26 which is in the form of a strip somewhat wider than the dimension of the recess 25 from the inner face of the door toward the outer face of the door. Accordingly, the inner edge of the member Z6 projects from the inner face of the border member 21 a substantial distance. The sealing edge member 26 is formed of strip material which is relatively thick, such as one-half inch, and the sides of the portion of the sealing edge member 26 projecting from the inner face of the border member 21 are chamfered or tapered so that the sealing edge member 26 has a relatively narrow edge 27 which is adapted to engage the sealing surface 15 on the jamb frame 12. The sealing edge member 26 is secured in position on the border member 21 by means of cap screws 28 which extend through holes in the sealing edge member 26 and into threaded holes in the border member. A thin gasket 30 formed of material such as asbestos paper is mounted between the sealing edge member 26 and the border member 21.

The sealing edge member 26 is preferably formed from a plurality of sections which are Welded together after-` they have been secured in position on the border member 21. The various sections of the sealing edge member 26 cooperate to provide a member which extends completely around the border member 21 and is adapted to engage the sealing surface 15 on a jamb frame 12 throughout the circumference of the opening through a jamb frame.

As the sealing edge member 26 is formed of strip material which is relatively thick, the sealing edge member may be pressed against the jamb frame with substantial force without danger that the sealing edge member will be permanently deformed, and without danger that the sealing member will bend or twist so that the edge 27 does not have gas tight engagementwith the jamb frame. Even though the sealing edge member 26 is formed of material of substantial thickness, the total amount of material in this member is not Very great, and this member can be formed of corrosion resistant material, such as stainless steel, without objectionably increasing the cost of the door as a whole.

Furthermore, as the sealing edge member 26 is formed from a strip of material of substantial dimensions, and as the sealing edge member 26 is rigidly 4and firmly secured to the border member 21, which is an extremely heavy and rugged element, the sealing edge member 26 will not be readily deformed or damaged during fabrication of the door, nor during shipment and installation of the door. Accordingly, the door may be assembled substantially completev in a shop. The sealing edge member 26 may be attached, and its' narrow sealing edge 27 may be aligned, while the door is in the shop and before the door is shipped to the field for installation. This is desirable as facilities for aligning the sealing edge member are more readily available in a shop than in the ield where an oven battery is being installed. This arrangement is possible because the construction of the door is such that the sealing edge member 26 will remain in alignment during shipment and handling of the door.

The door includes means for exerting force to press the sealing edge member 26 against the sealing surface on a jamb frame 12. This means includes two latch bars, each of which transmits force through a yoke assembly to the border member 21 of the door. One latch bar is located adjacent the upper end of the door while the other latch bar is located adjacent the lower end of the door. The two latch bars and yoke assemblies are similar in construction and operation.

Referring to the upper half of Fig. l of the drawings, the yoke assembly associated with the upper portion of the door' comprises a pair of spaced parallel arms 35, one being located along each inner side of the border member 21. The upper ends of the arms are secured together by a cross member 36, whileV the lower ends of the arms 35 are secured together by a cross member 37. As shown in Fig. 2 of the drawings, the cross members 36 and 37 are in the form of pieces of angle iron with their ends welded to the faces of the arms 35. Each of the cross members is mounted so that a flat face is towards the inner face of the door.

The' upper end of each arm 35 is secured to the border member 21 by means of a pair of bolts 40 which extend through aligned openings in the arms and the border members. The holes through which. these bolts extend are slightly larger than the bodies of the bolts so that some movement of the arms relative to the border member is permitted. Flat washers are mounted on the bolts 40 between the arms and the border member to space the arms from the border member.

The lower end of each of the arms 35 is also secured to the border member 21 by means of two pairs of bolts 4l which extend through aligned openings in the arms and the border member7 while washers are mounted on these bolts between the arms and the border member. The holes in thea'rms and in the border member through which the bolts 41 extend are somewhat larger than the bodies of the bolts to permit movement of the arms relative to the border member.

As is clearly shown in the upper half of Fig. 2 ofthe drawings, the edge 0f each of the arms 35 towards the inner face of the .door is substantially straight throughoutV the length of the arm, while as may be seen in Fig. 3 of the drawings, the arms are secured to the border member in. such a manner that the edges of the arms towards the inner face ofthe door are in a plane somewhatfarther from 'the inner face of the door than the edge of the border member 21 towards the inner face of the door.

As is shown in Fig. 2 of the drawings, the edge of each arm 35 towards the outer face of the door slopes from an intermediate point on the arm towards the ends of the arm so that each arm is wider adjacent its mid-portion than at the ends. The arms 35, associated with the upper end of the door, are proportioned so that the widest part of each of the arms is located somewhat nearer to the upper end of the' arm than to the lower end of the arm.

As is clearly shown inv Fig. 3 of the drawings, angular brackets 45 are secured to the confronting faces of the arms 35 so as to provide a flat surface towards the outer face of the door. As is clear from Fig. l. of the drawings, the brackets 45 are secured to the arms 3,5 substantially at the widest part of the arms. As is shown inA Fig. 3, a latch bracket 46 extends between the brackets 45 and is secured thereto by means' of bolts 47. The latch bracket 46 has a centrally located recess therein in which there is secured a threaded bushing Se. The bushing 50 is adapted to receive the threaded endA of a shaft51 which has the latch bar 52 rotatably mounted thereon. The shaft 51 has a collar 53 formed thereon while a roller thrust bearing 54 is mounted in a recess in the latch bar 52 and engages a face of the collar 53. The latch bar 52 is secured on the shaft 51 by means of a washer 55 and a- Cotter pin 56, while the exposed end of the shaft 51 is square and is adapted to be received by the socket on a door machine, not shown. The ends of the latch bar 52 are adapted to be received by the notches or recesses in the latch or hook plates 24B on the jamb frame, while one arm of the latch bar 52 has thereon an enlargement 57, which is adapted to beV engaged by an operating member on a door machine, not shown, to move the latch bar between the position in which the ends of the latch bar project into the recesses in the hook plates and the position in which the ends of the latch bar are out of alignment with the hook plates.

As explained above, the yoke assembly associated with theA lower end of the door is similar in construction and operation to the yoke assembly associated with the upper end of the door. The lower yoke assembly as shown in the lower half of Fig. l, includes spaced parallel arms 6) which are connected together at their upper and lower ends by cross members 61 and 62, respectively. The arms carry the latch bar 63 and the latch bar screw or shaft 64, which are located somewhat nearer to the lower ends of the arms 60 than tothe upper ends of these arms. The upper ends ofthe arms 69 are secured to the border member 21 by bolts 65, while the lower ends of the arms 6i) are secured tothe border member 21 by bolts 66.

As is best shown in Fig. 2 of the drawings the cross members 36, 37, 61 and 62 are secured to the arms 35 and 60 of the associated yoke assemblies in such manner that when the door is initially assembled, or is clamped against an undistorted jarnb frame, the faces of the cross members toward the inner side of the door are located in the same plane, this plane being parallel to the plane of the face of the border member 2i at the inner face of the door. As is shown in Fig. 3 for the cross member 36, the plane of the faces of each of the cross members is offset ashort distance, such as one-quarter of an inch,

r towards the outer face of the door from the plane of the inner face of the border member 21.

As is shown in Fig. i, an upper hook bracket '7d Vis secured by bolts 71 to angular brackets attached to the arms 35 adjacent the lower ends thereof. Similarly, a lower hook bracket 74 is secured by bolts '75 to angular brackets attached to the arms 66 adjacent the upper ends thereof. The hook brackets 76 and 74 are adapted to receive lifting hooks on a door machine, not shown, to permit the door to be lifted and moved during its installation and removal.

The border member 21 has secured to the upper end thereof a-hook which is adapted to support the door from the projection 19 on a jamb frame. As is best shown in the upper portion of Figs. l and 2 of the drawings, this hook comprises a plate S1) which is substantially parallel to the portion of the border member 21 which extends across the top of the door. The plate 80 is secured to the border member 2l through members 31 and 82 which are welded to the border member 21 and to the plate dil. The lower face of the inner end of the plate 80 is curved or convex and is adapted to rest on the projection 19.

As is shown in Figs. l and 3, clamping plate 90 is mounted within the border member 21 and is located adjacent the face of the border member nearest the inner face of the door. The clamping plate 9i) is substantially rectangular and is of such size that when the plate is located centrally within the border member there is a space of substantial width preferably such as about two and one-half inches, from the outer edge of this plate to the inner face of the border member 21 throughout the circumference of the plate. In addition, as is shown in Fig. 3 of the drawings, the clamping plate 90 is somewhat narrower than the opening through a jamb frame with the result that when the door is in position on a jamb frame t2 the edges of the clamping plate are spaced a substantial distance from the edges of the jamb frame.

The clamping plate 90 is secured by bolts 91 to the cross member 36 at the top of the upper yoke assembly, and is secured by studs 92 to the cross member 62 at the lower end of the lower yoke assembly. The clamping plate 9d is also secured by studs 92 to the cross member 37 at the bottom of the upper assembly, and is secured by other studs 92 to the cross member 61 associated with the lower yoke assembly. As is shown in Fig. 3, spacers 94 in the form of washers which are relatively thick, such as about iive-eights of an inch, are mounted on the bolts 91 and the studs 92. The spacers 94 cause the plate 90 to be situated so that the face thereof on the outer face of the door is located a short distance farther towards the inner face of the door than is the edge of the border member 21.

Referring to Fig. 3 it will be seen that the holes in the cross member 36 through which the bolts 91 extend are of such size as to be substantially filled by these bolts, while the nuts on these bolts cause the spacers 94 to be firmly compressed between the clamping plate 94) and the cross member 36 at the upper end of the door. Hence, the clamping plate 90 is rigidly secured to the cross member 36, and thus to the border member 21, so that the clamping plate is supported from the border member through the arms 35 and the cross member 36 of the upper yoke'assembly.

Referring to Fig. 4 it will be seen that the holes in the cross member 61 are substantially larger in diameter than the studs 92, while each of the studs 92 has mounted thereon a tubular spacer 93 of substantially smaller external diameter than a hole in the cross member. Each of the spacers 93 is somewhat longer than the thickness of the arm of the cross member so that when a washer and a nut are placed on a stud, and the nut is tightened, a space of substantial size, such as for example, onequarter of an inch, will be present between the washer and the cross member. Likewise, the holes in the cross members 37 and 62 are relatively large and the studs 92 associated with these cross members have similar tubular spacers mounted thereon.

The space between each of the tubular spacers 93 and a cross member permits the clamping plate 90 to adjust itself both transversely and vertically with respect to the border member as may be required as a result of different temperature conditions to which the clamping plate and the border member are subjected while in service. As hereinafter explained, the space between the cross members and the washers on the studs 92 permits the border member 21 to move or flex a limited amount rela tive to the clamping plate without being restrained by the clamping plate and without objectionably deflecting or bending the clamping plate. The nuts and Washers on the studs 9i. and 92 restrict the range of movement of the clamping plate 99 relative to the border member 21 and prevent the clamping plate from moving far enough to injure the iexible metal sealing diaphragm which connects the clamping plate and the border member, as hereinafter explained.

As the clamping plate 90 is separated from the yoke members by the spacers 94, which-are relatively thick but have relatively small cross-sectional area, there is little conduction of heat from the clamping plate 90 to the yoke assemblies. In like manner, as the yoke assemblies do not touch the border member 21 except at restricted areas adjacent the connecting bolts, there is little conduction of heat from the yoke assemblies to the border member. Accordingly, there is relatively little heat transfer from the clamping plate 90 to the border member 2li.

As isshown in Fig. 3, the clamping plate 90 has secured to the inner face thereof the liner retainer sections 95, each of which is an angular member extending along a portion of one side of the clamping plate. As is shown in Fig. 2, the liner retainer sections are secured to the clamping plate 90 by means of a plurality of studs 96 and 98. The studs 98 are firmly tightened and serve as anchor studs, whereas the studs 96 are hand tightened so that the retainers which are subject to higher temperatures than the clamping plate may expand without deflecting the clamping plate to which they are fastened.

As is shown in Fig. 2, the liner sections are connected tog-ether a plurality of spaced points by means of cross members 9'? which are welded to the liner retainers 95. The cross members 97 reinforce the liner retainer sections and prevent them from spreading, while the cross members 97 help to support the refractory plug which is secured between the liner retainers. The lower ends of the lowest liner retainer sections 95 are connected together by the plate 100 which is a relatively thick member which extends from the face of the clamping plate considerably farther than the liner retainers. The plate liti@ is of substantially the shape of the refractory plug and supports the lower end of the plug.

As shown in Fig. 2, the liner retainer sections 95 extend substantially to the upper edge of the clamping plate 99. However, the upper end of each of the upper liner retainer sections 95 is cut away or reduced in width for a short distance, the portion of reduced width extending to a point somewhat below the bolts 91 by which the clamping plate 99 is secured to the cross member 36.

As is shown in Fig. 3, the refractory liner 102, which is mounted on the inner face of the clamping plate 90 between the liner retainers 95, may be of any desired construction. It may, for example, be built up of refractory shapes embedded in refractory cement, or it may be formed entirely of refractory cement. The face of the refractory plug on the inner face of the door has rounded corners, while the plug is of such thickness that when the door is in position on a jamb frame, the plug extends into an oven chamber for a substantial distance. The plug ftd@ is of such` width that when the door is in position on a jamb frame, the sides of the plug are spaced a substantial distance, such as for example about one and iive-eighths inches from the wallsI of the oven chamber, so as to permit coal to enter into the clearance to stop gas passage and thus prevent carbon from forming on the door retainers and the plug.

As shown in Fig. 2, the upper end of the refractory plug 192 is inclined and slopes toward the oven chamber, while the refractory plug terminates below the level of the bolts 91 by meansof which the clamping plate 90 is secured to the cross member 36.

sides of the border member 21, while the inner face of the rectangle overlies the outer edge of the clamping plate 90.*A thin gasket 106 of suitable material, such as sheet asbestos, is mounted between the sides 104 of the sealing diaphragm 105 and the border member 21, while a similar gasket 107 is mounted between the sealing diaphragm 105 and the face of the clamping plate 90. The sealing diaphragm 105 is secured to the border member 21 by a plurality of screws 110 which extend through elongated. holes in the sides'104 of diaphragm or plate 105 into threaded openings in the border member 21. The screws 110 also extend through a clamping bar 11.1 which engages the side 104 of the plate. The clamping bar 111 is relatively thick, so that it is relatively rigid and the portions of the bar between adjacent screws 110 are effective to hold the sides 104 of diaphragm 105 firmly against the border member 21 and prevent escape of gas between the diaphragm 105 and the border member. The clamping bar 111 may be formed from a plurality of sections' which cooperate to form a rectangular assembly'which extends completely around the inner periphery of border member 21.

The 'inner' edge of the sealing diaphragm or plate 105 is secured to the clamping plate 90 by a plurality of screws- 113 which extend through elongated holes in a clamping har 114 and are secured in threaded holes in 'Y the clamping plate 90. The bar 114 serves to hold rmly against the plate 90 the portions of the plate 105 between adjacent screws 113. The clamping bar 114 may be formed of a plurality of sections which cooperate to form a rectangular assembly which extends completely around the clamping plate 90.

As shown in Fig. 3, the various portions of the door are arranged and proportioned so that when the border member 21 is undeflected and the sealing plate 105 is secured against the inner face of the border member 21 and against the outer face of the clamping plate 90, the sealing plate 105 is substantially flat.

. rlhe door is shown in position on a jamb frame and is held in place by pressure exerted by the latch bars 52 and 63.

The jamb frame 12 illustrated is undistorted so that the sealingV surface 15 thereon is substantially flat.

When the door is to be removed a door machine, not shown, is brought into alignment with the door, and sockets on the door machine rotate the latch screws 51 and 64 to advance them into the threaded nuts or bushings and thus release pressure on the latch bars. The latch bars 52 and 63 are thereafter turned to move their ends out of the notches or recesses in the hook plates 20. The door may then be lifted from the jamb frame by elements on the door machine which engage the lifting hooks '70 and 74.

When the door is to be replaced the door is brought into alignmenty with the jamb frame 12 and is then moved by the door machine towards the jamb frame until the plate 80 at the top of the door extends over the projection 19 on the jamb frame 12. The door is now released by the door machine so that the door is suspended from the projection 19. The latch bars 52 and 63 are now rotated to cause their ends to project into the recesses in the hook plates 20, while the latch screws 51 and 64 are then rotated to cause them to move out of the associated bushings, thus pressing the latch bars 52 and 63 against the hook plates so that on further turning of the screws the door is forced towards the jamb frame.

As previously pointed out the jamb frame 12, because of unequal heating of its inner and outer faces, may be slightly warped or curved in the vertical plane, the concave side of the jamb frame being outward. Hence, when the door is brought up to a jamb frame and is initially pressed towards the jamb frame, the portions of the sealing edge member 26 across the top and bottom of the door engage the sealing surface 15 on the jamb frame 12, while the portions of the sealing edge member 26 alongV the sides of the door, and particularly near the middle of the door, may not touch the sealing surface 15 on the jamb frame, but may be spaced therefrom a short distance.

On rotation of the latch bar screws 51 and 64 force is exerted through the associated bushings on the cross members in which the bushings are mounted, while force exerted on these cross members is transmitted through the arms 35 and 60 of the yoke assemblies to the border member 21.

Referring to Figs, l and 2 of the drawings, it will be seen that the cross member 46 associated with the upper yoke assembly, is located above the middle of the arms 35. Accordingly, when the latch screw 5 1 exerts force to move the bracket 46 to the right as viewed in Fig. 2, the upper ends of the arms 35 press the upper ends of the border member 21 toward the jamb frame to thereby rmly press the accompanying portions of the sealing edge member 26 against the jamb frame. On continued movement of the bracket 46 the arms 35 pivot on the bolts 40 at their upper ends as fulcrums, and the lower ends of the arms 35 exert force through the bolts 41 to press towards the jamb frame the portions of the border member 21 adjacent the middle of the door, thus forcing the accompanying portions of the sealing edge member 26 against the sealing surface 15. At this time the portions of the border member 21 along the sides of the door are bent or deflected from their original position. However, the

Y amount of deflection of the border member 21 is relatively small and is well within the elastic limits of the material of which the border member is constructed. l

The latch screw 64 associated with the lower latch bar 63 is tightened at the same time that the latch screw 51 associated with the upper latch bar is tightened. Hence, the screw 64 exerts force through the associated bracket on the arms of the lower yoke assembly. When the latch screw 64 is tightened, the lower ends of the arms 60 press the lower end of the border member 21 towards the jamb frame so that the portion of the sealing edge member 26 across the bottom of the door firmly engages the sealing surface 15 on the jamb frame. On lfurther, tightening of the latch screw 64 the arms 60 pivot on the bolts 66 at their lower ends as fulcrums with the result that the upper ends of the arms 60 exert force through the bolts 65 to press the side portions of the border member 21 towards the jamb frame. The force exerted by the arms 60 of the lower yoke assembly supplements the force exerted by the arms 35 of the upper yoke assembly to press the mid-portion of the border member towards the jamb frame. The force exerted by the arms of the upper and lower yoke assemblies on the mid-portion of the border member gradually detlects this portion of the border member to cause the associated portion of the sealing edge member 26 to engage the sealing surface 15 on the jamb frame.

As explained above, the portions of the sealing edge member 26 across the top and bottom of the door are in engagement with the sealing surface 15 on the jamb frame on initial tightening of thel latch bar screw. At this time, under conditions in which there is some curvature of the jamb frame, the portions of the sealing edge member 26 along the sides of the door do not touch the jamb frame, the space from the surface on the sealing edge member 26 to the surface 15 on the' jamb frame 12 gradually varying from nothing at the ends kof the door to about one-quarter or one-half an inch at the middle of the door, the amount i t 13 depending on the amount of curvature of the jamb frame.

As the latch bars are tightened and the mid-portion of the border member of the door is pressed towards the jamb frame, the portions of the sealing edge member 26 across the ends of the door remain in contact With the surface on the jamb frame 12, while the portions of the member 26 on the sides of the door from the ends of the door towards the middle are gradually and progressively brought into contact with the surface 15 on the jamb frame 12until the sealing edge member 26 throughout the entire length of the sides of the door is rmly and tightly in engagement with the surface 15 on the jamb frame.

The arrangement of the various elements of the door is such that the border member 21 can Hex or bend to conform to the shape of the sealing surface 15 on the jamb frame 12 without objectionably bending or flexing the clamping plate 9th. In addition, the arrangement of the various elements of the door is such that the relatively rigid clamping plate 9G does not objectionably interfere with or retard flexing or bending of the border member 21.

in Fig. 2 of the drawings, the various elements of the door are illustrated in the relative positions which they occupy when the door is detached from a jamb frame, or is secured to a jamb frameon which the sealing surface 15 is not distorted. At this time the faces of the cross members 36, 37, 61 and 62 towards the inner face of the door are substantially in the same plane. In addition, at this time the clamping plate 9d, which carries the refractory plug M2, is supported from the cross member 36 by the bolts 91 which extend through holes in the plate 9d located near the upper edge of the plate 99 and above the upper end of the refractory plug 102.

As explained in detail above, when the door is employed on a jamb frame on which the sealing surface 15 is warped or curved, and the latchscrews 51 and 64 are tightened, the lower ends of the arms 35, and the upper ends of the arms 60, exert force on the mid-portions of the border member 21 to deflect or bend the border member towards the jamb frame, that is, to the right as viewed in Fig. 2.

When the mid-portion of the sides of the border member yield or bend, the lower ends of the arms 35, and the upper ends of the arms 66, together with the cross members 37 and 61, move to the right, as viewed in Fig. 2 of the drawings, and press on the spacers 94 so as to press the mid-portion of the clamping plate 90 to the right.

As the upper end of the clamping plate 99 is rigidly and tightly attached to the cross member 36, `on movement of the mid-portion of the clamping plate 90 to the right, the plate bends or flcxes slightly in the vicinity of the bolts 91. The total amount of movement of the midportion of the clamping plate 96, if any, is relatively small, on the order of one-quarter of an inch, and this occurs at a point four or ve feet from the upper end of the clamping plate 9d, so the degree of flexing of the clamping plate in the vicinity of the bolts 91 is extremely small. Furthermore, such exing of the clamping plate 90, as does occur, takes place principally in the extreme upper end portion of the plate 99 which is located above the refractory plug 102, and the wide portions of the liner retainers 95. This portion of the plate 9h is more exible than the remainder of the plate, while flexing of this portion of the clamping does not damage the refractory plug 102.

As a result of movement of the mid-portion of the clamping plate 9) to the right while the upper end of the clamping plate is substantially rigidly secured relative to the border member 21, the lower end of the clamping plate 9i) moves to the right away from the cross member 62. The lower end of the clamping plate 90 is free to `move a predetermined amount to the right as the tubular spacers 93 on the studs 92 at the lower end of the clamp-` ing plate maintain a predetermined amount of clear'- ance between the nuts and washers on these studs and the face of the cross member 62. Hence, the lower end of the clamping plate 90 moves to the right and draws the studs 92 through the holes in the cross member 62 until the washers on these studs engage the cross member 62, thus preventing further movement of the clamping plate 91) relative to the cross member 62 and to the border member 21.

lf the flexing or bending of the mid-portion of the border member 21 continues after further movement of the lower end of the clamping plate has been prevented by the studs 92, the mid-portion of the clamping plate 90 will be bent or deflected. However, the range or magnitude of this bending of the mid-portion of the clamping plate 9d, if it occurs at all, is relatively slight and does not exceed the flexibility in the refractory plug 102 which is provided by the expansion joints incorporated in this plug. As the amount of flexing of the clamping plate 90 is extremely small, if there is any flexing at all, the clamping plate will not interfere with flexing of the border member 21, while this flexing of the clamping plate will not adversely affect the refractory plug.

On movement of the middle and lower portion of the clamping plate 90 relative to the border member 21 the exible sealing diaphragm 105 is deflected. However, the possible amount of movement of the clamping plate 90 relative to the cross member 62 is limited by the nuts and washers on the studs 92, and the movement of the clamping plate is restricted to an amount such that this movement can be accommodated by the exible sealing diaphragm 105 without risk of injury to this diaphragm. The relatively great width of the sealing diaphragm 105 between the points of attachment to the border member 21, and to the clamping plate 9d, together with the restricted range of movement of the clamping plate 90 relative to the border member 21, cooperate to insure that the sealing diaphragm 1%5 will not be injured or overstressed.

As explained in detail above, the latching means exert force through the yoke assemblies, and the arrangement of` the yoke assemblies is such that they hold the portions of the sealing edge member 26 across the ends of the border member 21 rmly against the jarnb frame, both during movement of the mid-portions of the sides of the border member towards the jamb frame, and after the mid-portions of the sides of the border member have been pressed into engagement with the jamb frame.

As is apparent in Figs. l and 2, the cross members on which the latch bars 52 and 63 are mounted are secured to the arms 35 and 6i) nearer the ends of these arms which are attached adjacent the top and bottom of the door than to the ends of these arms which are attached adjacent the middle of the door. When the latch bars exert force through the cross members on the arms of the yoke assemblies, the total force exerted through each of the arms is divided between the two ends of the arm inversely according to the distance from the cross bar to the point of attachment of the bar with the border member. Since the cross members are secured to the arms of the yoke assemblies relatively near the ends of these arms which are secured adjacent the ends of the door, it follows that a major portion of the force exerted through each of the latch bars is exerted on an end of the door so that the portions of the sealing edge member 26 across the top and bottom of the door, and also the portions of this member around the corners of the door, are certain to be rrnly pressed against the sealing surface 15 on the jamb frame 12. Furthermore, the force effective to press against the jamb frame the portions of the sealing edge member 26 across the ends and around the corners of the jamb frame is maintained undiminished even after the latch bars have been tightened so as to cause the portion of the sealing edge member adjacent the middle of the sides of the door to be pressed against the surface 15- on the jamb frame. l

It will be seen also that the operation of the yoke assemblies is such that tightening of the latch bars after the ends of the door engage the sealing surface on the jamb frame causes force to be exerted on the mid-portion of the door to insure that the sealing edge member associated with this portion of the door firmly engages the jamb frame.

Accordingly, it will be seen that the sealing edge member 26 is certain to firmly engage the sealing surface 15 on the jamb frame 12 throughout the circumference of the surface 15 even though this surface is not perfectly flat, but is warped or curved. Hence, the door forms a tight seal and effectively prevents escape of gas from a coking chamber.

When the force exerted by the latch bars is released, as during removal of a door, the inherent resiliencyy of the material of which the border member 21 is constructed causes the portions of this member along the sides of the door to return to their original condition so that on subsequent installation of the door and tightening of the latch bars, the border member will again be deflected -to conform to the sealing surface on the jamb frame. As the border member does not become permanently deected by the forces exerted thereon, but resumes its original shape whenever these forces are released, the border member retains the flexibility which enables it to adjust itself to the jamb frame.

1n addition, when the force exerted by the latch bars 52 and 63 is released, the lower ends of the arms 35 of the upper yoke assembly, and the upper ends of the arms 6i) of the lower yoke assembly, cease to exert force on the mid-portion of -the sides of the border member and they return to their original position. Furthermore, at this time the cross members 37 and 61 cease to deiiect the mid-portion of the clamping plate 90, if they had deflected it, and the lower end of the clamping plate 96 moves back to the position determined by the spacers 94 on the studs 92 associated ywith the cross member 62. During this movement of the mid-portion of the sides of the border member, and during this movement of the clamping plate, the stresses on the flexible sealing diaphragm 105 are released, and this diaphragm resumes its original substantially flat condition.

Referring to Figs. 6-8 the improved door is shown adapted with a conventional chuck door arrangement for use on the pusher side of a coking chamber. The border member 21, the spaced parallel arms 35 and the latch bracket 46 with its cooperating structure are substantially the same as those shown in Figs. 15. However, as is shown in Fig. 8, the upper portion of the clamping plate 90 has a rectangular recess 120 cut therein through which a ieveller bar may be inserted to level the coal in the coking chamber. Facing the oven side of the clamping plate 9i) and surrounding the rectangular recess 120 is the rectangular recessed casing frame member 121. This casing member, which helps to shield the opening from the high oven temperatures, is fastened to the clamping plate 91B by bolts 122 and further serves to brace the door in the area of the clamping plate. Facing the opposite side of clamping plate 90 and xed thereto is a chuck door jamb frame member 123 which surrounds the periphery of the rectangular recess 121). On the lower edge of lthe jamb frame 123 is welded a steel chute plate 124 which extends in a downward angle away from the recess to defleet any excess particles of coal that may fall from the recessed opening during a levelling operation.

As is best shown in Figs. 7-8, the rectangular recess 1219 is adapted to be closed by the chuck door member 125 which when latched in the closed position makes ,knife edge sealing Contact with the jamb frame 123. The latch mechanism employed for so holding the chuck door in a sealed closed position ,comprises a latch bar 126, which latch bar has a centrally Ylocated recess therein in which 1.6 there is secu-red an internally threaded bushing 127 The bushing is adapted to receive the threaded end of a shaft 1,28 one end of which Vis connected to the chuck door member 125. A hand4 wheel 129 having a plurality of cireumferentially spaced holes 130 is fastened to the other end of the shaft ,1,28 by nut 133. The spaced holes allow a workman to stand'at a safe distance from the chuck door and rotate the hand wheel with a rod to seal the door closed. Extending Vfrom one side of the bushing 127 is the bifurcated arm member 131 of the latch bar 126, each of the bifurcations terminating in sleeves 132. These sleeves surround the pintle 134 of `the hinge 136 so that the latch bar 126 and the chuck door member 125 attached thereto may be pivoted about the pintle. The

V hinge 136 is secured to one side of border member 21 asl shown in Figs. 6 and 7, Extending from the opposite side of the bushing'127 is the arm member 137 of the latch bar 126. The arm member is adapted to come into engagement with the hook arm 138 when the chuck door is closed, the hook arm being pivotally connected to the opposite side of the border member'Zl. When the latch bar is pivoted about the pintle 134 to the closed position, proper rotation of the hand wheel will cause the chuck door to come into knife edge sealing engagement with the chuck door frame member 123, thus sealing off the recess 120 from the atmosphere.

As is best shown 4in Figs. 6 and 8, the rectangular recess 120 in the upper portion of clamping plate 90 tends to structurally weaken the portion of the plate. To strengthen it, a cross member 139 in the form of an angle iron is bolted to the clamping plate below the chuck door by bolts 140. This cross member extends horizontally across the clamping plate 90 allowing a small clearance between its ends and the inner sides of arms 3S. Welded at the ends of the cross member are-plates 142. Bolts 143 fasten plates 142 to the sides of border member 21, the bolts passing through aligned holes in the plates 142 and yoke arms 35. These holes are of sufliciently larger diameters than the bolt diameters to permit the clamping plate 90 to adjust itself both transversely and vertically with respect to the border member as may be required as a result of temperature differences between the border member and the clamping plate.

The improved door of this invention is also adapted to be used with a spring-type latch mechanism substantially like that disclosed in Franz Doll patent application Serial No. 297,433, filed July 7, 1952 as well as other springtype latch mechanisms.

vThe improved door of this invention in combination with a spring-type latch mechanism provides a closure means for coke 'ovens heretofore unknown. The aforesaid combination cooperates to provide a closure means for distorted jamb frame members which can be easily adjusted to the required position and removed. The cornbination of the improved Vdoor with a spring-type latch mechanism, particularly the spring-type mechanism disclosed in Franz Doll application No. 297,433, is a feature .of this invention.

The invention claimed is:

l. A coke oven d-oor of the self-sealing type adapted to be employed with a jamb frame, located at an end of a horizontal coking chamber, having a rectangular opening therethrough surrounded by a flat sealing surface, said door comprising la rectangular frame shaped border member r ,having the shape of the sealing surface on said jamb frame and having an opening disposed therein surrounded by said border member,- a clamping plate spaced from said border member and in alignment with said opening in said border member to partially close said opening, a flexible metal sealing `diaphragm having its p eripherally outer edge se- Vcured to said border memberand having its peripherally `inner edge secured to said clamping plate to permit said border member to move relative said clamping plate and to Acomplete the closing of said opening, a sealing edge element secured to said border member and having projecting from the face of said border member at the inner face of said door a relatively narrow edge portion extending completely around said door and adapted to engage the sealing surface on a jamb frame throughout the circumference of said surface, and means associated with said border -member and adapted to cooperate with a jamb frame to exert force on the border member sealing edge on said border member towards the sealing surface on said jamb frame.

2. A coke oven door of the self-sealing type adapted to be employed with a jamb frame, located at an end of a horizontal coking chamber, having a substantially rectangular opening therethrough surrounded by a llat sealing surface, said door comprising a rectangular frame shaped border member having the shape of the sealing surface on said jamb frame and having an opening disposed therein surrounded by said border member, a clamping plate spaced from said border member and in alignment with said opening in said border member to partially close said opening, a flexible metal sealing diaphragm having its peripherally outer edge secured to said border member and having its peripherally inner edge secured to said clamping plate to permit said border member to move relative said clamping plate and to complete the closing of said opening, a sealing edge element secured to said border member and having projecting'from the face of said border member at the inner face of said door a relatively narrow edge portion which extends completely around said door and is adapted to engage the sealing surface on a jamb frame throughout the circumference of said surface,

an upper yoke assembly comprising a pair of parallel arms each of which has one end connected to a side of the border member at a point adjacent the upper end of a side of the door and has its other end connected to a side of the border member at a point adjacent the mid-portion of the side of the door, a lower yoke assembly comprising a pair of parallel arms each of which has one end con nected to a side of the border member adjacent the lower end of a side of the door and has its other end connected to a side of the border member at a point adjacent the midportion of the side of the door, and means on each yoke assembly for exerting on the arms thereof intermediate their ends force effective to press the sealing edge on said border member towards the sealing surface on a jamb frame.

3, A coke oven door of the self-sealing type adapted to be employed with a jamb frame, located at an end of a horizontal col/,ing chamber, having a rectangular opening therethrough surrounded by a at sealing surface, said door comprising a rectangular frame shaped border member having the shape of the sealing surface on said jamb frame and having an opening disposed therein surrounded by said border member, a clamping plate spaced from said border member and in alignment with said opening in said border member to partially close said opening, a flexible metal sealing diaphragm having its peripherally outer edge secured to said border member and having its peripherally inner edge secured to said clamping plate to permit said border member to move relative said clamping plate and to complete the closing of said opening, a sealing edge element secured to said border member and having projecting from the face of said border member at the inner face of said door a relatively narrow edge portion which extends completely around said door and is adapted to engage the sealing surface on a jamb frame throughout the circumference of said surface, an upper yoke assembly comprising a pair of parallel arms each of which has one end connected to a side of the border member at a point adjacent the upper end of a side of the door and has its other end connected to a side of the border member at a point adjacent the mid-portion of the side of the door, a lower yoke assembly comprising a pair of parallel arms each of which has one end connected to a side of the border member at a point adjacent the lower end of a side of the door and has its other end connected to a side of the border member at a point adjacent the mid-portion of the side of the` door, each yoke assembly including a cross member extending between the arms of said assembly and connected with each of said arms intermediate the ends of said arm, each of said cross members carrying a latch bar which is adapted to cooperate with a jamb frame to exert force to press the door towards said jamb frame.

4. A coke oven door of the self-sealing type adapted to be employed with a jamb frame, located at an end of a horizontal coking chamber, having a rectangular opening therethrough surrounded by a flat sealing surface, said door comprising a rectangular frame shaped border member having the shape of the sealing surface on said jamb frame and having an opening disposed therein, said border member having projecting from the face thereof on the inner face of the door a relatively narrow sealing edge portion extending completely around the door and adapted to engage the sealing surface on a jamb frame throughout the circumference of said surface, an upper and a lower yoke assembly, each of said yoke assemblies comprising a pair of spaced parallel arms each having one end connected with a side of said border member adjacent the midportion of said side and having the other end connected with said border member adjacent an end of the door, means associated with each yoke assembly for exerting force through the arms thereof to press said border member towards the sealing surface on a jamb frame, and means cooperatively connected to said border member including a ilexible diaphragm for closing the opening surrounded by said border member.

5. A coke oven door of the self-sealing type adapted to be employed with a jamb frame located at an end of a horizontal coking chamber, having a rectangular opening therethrough, surrounded by a flat sealing surface, said door comprising a rectangular frame shaped border member having the shape of the sealing surface on said jamb frame and having an opening disposed therein, said border member having projecting from the face thereof on the inner face of the door a relatively narrow sealing edge portion extending completely around. the door and adapted to engage the sealing surface on a jamb frame throughout the circumference of said surface, latch bar means and means for exerting the pressure of the latch bar means on the door comprising means extending vertically from said latch bar means to exert a constantly equal ratio of force on the portions of said border member on the sides of the door only 'at points located adjacent the top and bottom of the door and adjacent the mid-portion of the door regardless of door jamb frame distortion effective to press said border member towards the sealing surface on a jamb frame, and means cooperatively connected with said border member including a ilexible diaphragm for closing the opening surrounded by said border member.

6. A coke oven door of the self-sealing type adapted to be employed with a jamb frame located :at an end of a horizontal coking chamber, having a rectangular opening therethrough, surrounded by a flat sealing surface, said door comprisinga rectangular frame shaped border member having the shape of the sealing surface on said jamb frame and having an opening disposed therein, said bor-l der member having projecting from the face thereof on the inner face of the door a relatively narrow sealing edge portion extending completely around the door and adapted to engage the sealing surface on a jamb frame throughout the circumference of said surface, and means for exerting force on said border member effective to cause the sealing edge carried thereby to engage throughout the periphery thereof the sealing surface on a jamb frame on which the sealing surface along the sides thereof are concave, said means including latch bar means and means for exerting the pressure of the latch bar means on the door comprising means extending vertically from the latch bar means to exert a constantly equal ratio of force on the portions of said border member only at points located adjacent the ends of said door and adjacent the mid-portion of the door regardless of door jamb frame distortion to press said border member towards the sealing surface on a jamb frame, and means cooperatively connected with said border member including a flexible diaphragm for closing the opening surrounded by said border member.

7. In combination, a coke oven door of the self-sealing type and a jamb frame located at an end of a horizontal coking chamber, having a rectangular opening therethrough, surrounded by a at sealing surface, said jamb frame having on its outer face at its upper end an outwardly extending projection, said door comprising a rectangular frame shaped border member having the shape of the sealing surface on the jamb frame and having an opening disposed therein, said border member having projecting from thel face thereof on the inner face of the door a relatively narrow sealing edge portion extending completely around the door and adapted to engage the sealing surface on the jamb frame throughout the circumference of said surface, a clamping plate member spaced from said border member and in alignment with said opening in said border member to partially close said opening, said clamping plate having a refractory plug mounted on the face thereof towards the inner face of the door, said members being connected together so that one of said members is supported from the other of said members, one of said members having adjacent the upper end thereof a hook which is adapted to extend over said outwardly extending projection on said jamb frame to support the door from said projection, means cooperatively connected to said border member including a flexible metal diaphragm for completing the closing of said opening by sealing the opening between said clamping plate member and said border member, and means associated with said border member and adapted to cooperate with said jamb frame to exert force on the border member 'to press said sealing edge on said border member towards the sealing surface on said jamb frame.

' 8. In combination, a coke oven door of the self-sealing type and a jamb frame located at an end of a horizontal coking chamber, having av rectangular opening therethrough, surrounded by a flat sealing surface, said jamb frame having on its outer face at its upper end an outwardly extending projection, said door comprising a rectangular frame shaped border member having the shape of the sealing surface on the jamb frame and having an opening disposed therein, said border member having projecting from the face thereof on the inner face of the dQQI alV relatively narrow sealing edge portion extending completely around the door and adapted to engage the sealing surface on the jambframe throughout the circumference of said surface, a clamping plate member,V spaced from said border member and in alignment with said opening in said border member to partially close said opening, said clamping plate having a refractory plug mounted onthe face thereof towards the inner face of the door, means for securing said clamping plate member and said border member together at a plurality of points located intermediate the upper and lower ends of said border mem ber, means located at a plurality of points spacedv apart from said last-named means for securing said border member and said clamping plate member together so as to permit only a limited amount of movement of the associated portions of the clamping plate member andthe border member relative to each other in the direction between the inner and outer faces of the door, one of said members having adjacent the upper end thereof a h ook which is adapted to extend over said outwardly extending projection onsaid jamb frame to support the door from said projection, a recessed flexible metal diaphragm in the form of a rectangle having its inner edge secured to said clamping plate member and having its outer edge secured to said` border member to complete the closing of said border member opening, and means associated with said border member and adapted to cooperate with said jamb CLI 20 frame to exert force on the border member to press said sealing edge on said border member towards the sealing surface on said jamb frame.

9. In combination, a coke oven `door of the self-sealing type and a jamb frame located at an end of a horizontal coking chamber, having a rectangular opening therethrough, surrounded by a flat sealing surface, said jamb frame having on its outer face at its upper end an outwardly extending projection, said door comprising a rectangular frame shaped border member having the shape of the sealing surface on the jamb frame and having an opening disposed therein, said border member having projecting from the face thereof on the inner face of the door a relatively narrow sealing edge portion extending completely around the doo-r and adapted to engage the seal* ing surface on the jamb frame throughout the circumference of said surface, a clamping plate member spaced from said border member and in alignment Vwith said opening in said border member to partially close said opening7 means for securing said clamping plate member and said border member together at a plurality of points in a horizontal plane located adjacent the upper end of said clamping plate member, means located at a plurality of points spaced apart vertically from said last-named means for seeming said border member and said clamping plate member together so as to permit only a limited amount of movement of the associated portions of the clamping plate member and the border member relative to eachother in the direction between the inner and outer faces of the door, one of said members having adjacent the upper end thereof a hook which yis adapted to extend over said outwardly extending projection on a door frame to support the door from said projection, a flexible metal diaphragm inthe form of a rectangular frame having its inner edge secured to said clamping plate member and havingA its outer edge secured tosaid border member to complete the closing of said border member opening, said clamping plate member having secured on the face thereof towards the inner face of the door a refractory plug whichV extends substantially from the lower end of said clamping plate member to a point below the securing means located adjacent the upper end of said clamping plate member, and means associated with said border member and adapted to cooperate with said jamb frame to exert force on the border member to press said sealing edge on said border member towards the sealing surface on said jamb frame.

l0. A coke oven door of the self-sealing type adapted to be employedl with a jamb frame located at an end of a horizontal coking chamber, having a rectangular opening therethrough, surrounded by a flat sealing surface, said door comprising a rectangular frame shaped border memoerv having the shape of the sealing surface on said door frame and having an opening disposed therein, said border member havingprojecting from the face thereof on the inner face of the door a relatively narrow sealing edge portion extending completely around the door and adapted to engage the sealing surface on a jamb frame throughout the circumference of said surface, an upper and a lower yoke assembly, each of'said yoke assemblies comprising a pair of spaced parallel arms each of which has one end connected with a side of said border member adjacent the mid-portion of said side and has its other end connected with -said border member at a point `adjacent an end of the door, the upper and lower ends of the opposite arms of each of said yoke assemblies being connected together by a cross member, a clamping plate spaced from said border member and in alignment with said opening in said border member to partially close said opening, said plate being located on the side of said cross members towards the inner face of the door, means for rigidly securing said clamping plate member to one of said cross members, means associated with at least one of the remaining cross. membersk for securing said clamping plate member thereto so as: to permit only a predetermined amount of movement of the'clamping plate member relative to said cross member in the direction between the inner and outer faces of the door, a flexible metal diaphragm in the form of a rectangular frame having its inner edge secured to said clamping plate member and having its outer edge secured to said border member to complete the closing of said border member opening, a refractory plug mounted on the face of said clamping plate member towards the inner face of the door, and means associated with each yoke assembly for exerting force through the arms thereof to press said sealing edge on said border member towards the sealing surface on a jamb frame.

l1. A coke oven door of the self-sealing type adapted to be employed with a jamb frame located at an end of a horizontal coking chamber having extending therethrough a rectangular opening, surrounded by a flat sealing surface, said door comprising a frame shaped border member in the form of a rectangular loop to form an opening therein and having the shape of the sealing surface on a jamb frame, said border member having projecting from the face thereof on the inner face of the door a sealing edge portion terminating in a relatively narrow sealing edge extending completely around the door and adapted to engage the sealing surface on a jamb frame throughout the circumference of said surface, an upper and a lower yoke assembly, each of said yoke assemblies comprising a pair of spaced vertically extending parallel arms each of which has its iirst end connected with said border member adjacent the mid-portion thereof and has its second end connected with the border member at a point adjacent an end of the door, each yoke assembly including means adapted to cooperate with a jamb frame for exerting force through the arms of said yoke assembly to press the border member towards the sealing surface on a jamb frame, and means cooperatively connected to said border member including a j flexibie metal diaphragm for closing the area surrounded by said border member.

12. A coke oven door of the `self-sealing type adapted to be employed with a jamb frame located at an end of a horizontal coking chamber, having extending therethrough a rectangular opening surrounded by a flat sealing surface, said door comprising a frame shaped border member in the form of a rectangular loop to form an opening therein, and having the shape of the sealing surface on a jamb frame, said border member having projecting from the face thereof on the inner face of the door a sealing edge portion terminating in a relatively narrow sealing edge extending completely around the door and adapted to engage the sealing surface on a jamb frame throughout the circumference of said surface, an upper and a lower yoke assembly, each of said yoke assemblies comprising a pair of spaced vertically extending parallel arms each of which has its first end connected with said border member adjacent the mid-portion thereof and has its second end connected with the border member at a point adjacent an end of the door, each yoke assembly including a cross member extending between and connected with the arms thereof, each yoke assembly including means adapted to cooperate with a door frame for exerting force through the cross member and arms of said yoke assembly to press the border member towards the sealing surface on a jamb frame, and means cooperatively connected to said border member including a flexible metal diaphragm for closing the area surrounded by said border member.

13. A coke oven `door of the self-sealing type adapted to be employed with a jamb frame located at an end of a horizontal coking chamber, having extending therethrough a rectangular opening surrounded by a at sealing surface, said door comprising a frame shaped border member in the form of a rectangular loop to form an opening, and having the shape of the sealing surface on a jamb frame, said border member having projecting from the face thereof on the inner face of the door a sealing edge portion which terminates in a relatively narrow sealing edge which extends completely around the door and is adapted to engage the sealing surface on a jamb frame throughout the circumference of said surface, an upper and a lower yoke assembly, each of said yoke assemblies comprising a pair of spaced Vertically extending parallel arms each of which has its rst end connected with said border member adjacent the mid-portion thereof and has its second end connected with the border member at a point adjacent an end of the door, each yoke assembly including a cross member extending between and connected with the arms thereof, each yoke assembly including means adapted to coopcrate with a jamb frame for exerting force through the cross member and arms of said yoke assembly to press the border member towards the sealing surface on a jamb frame, each of said force exerting means being connected with the arms of the associated yoke assembly nearer the second ends than the iirst ends thereof, and means cooperatively connected to said border member including a flexible metal diaphragm for closing the area surrounded by said border member.

14. A coke oven door of the self-sealing type adapted to be employed with a jamb frame located at an end of a horizontal coking chamber, having a rectangular opening therethrough surrounded by a llat sealing surface, said door comprising a frame shaped border member in the form of a rectangular loop to form an opening therein, and having the configuration of the sealing surface on said jamb frame, the material of said loop having a greater dimension in the direction between the inner and outer faces of the door than in the plane normal thereto, a sealing edge element associated with said border member and having projecting from the face of said border member on the inner face of the door a relatively narrow sealing edge portion extending completely around the door and adapted to engage the sealing surface on a jamb frame throughout the circumference of said surface, means associated with said border member and adapted to cooperate with means on a jamb frame to exert force to press said sealing edge on said border member towards the sealing surface on the jamb frame, said means including latch bar means and means for exerting the pressure of the latch bar .means on the door comprising means extending vertically from the latch bar means to exert `a constantly equal ratio of force on said border member only at points located adjacent the ends of the door and adjacent the mid-portion of the sides of the door regardless of door jamb frame distortion, and means cooperatively connected to said border member including a flexible metal diaphragm for closing the area surrounded by said border member.

15. A coke oven door of the self-sealing type adapted to be employed with a jamb frame located at an end of a horizontal coking chamber having a rectangular opening therethrough surrounded by a flat sealing surface, said door comprising a frame shaped border member in the form of a rectangular loop having the configuration of the sealing surface on said jamb frame, the material of said loop having a greater dimension in the direction between the inner and outer faces of the door than in the plane normal thereto, a sealing edge element associated with said border member and having projecting from the face of said border member on the inner face of the door a relatively narrow sealing edge portion extending completely around the door and adapted to engage the sealing surface on a jamb frame throughout the circumference or" -said surface, a plurality of parallel vertically spaced cross members extending transversely of said door and connected to the portions of said border member on the sides of said door, a clamping plate substantially filling the area surrounded by said border member, -said clamping plate being located on the Side of said cross members toward the inner face of said door and having mounted on the face thereof toward the inner face of said door a refractory plug, said clamping plate being rigidly secured to one of said cross members and being, secured to at least one of the other cross members so that said clamping plate and said cross member have a limited restricted range of movement relative to each other in the direction between the inner and outer faces of the door, means including a iexible metal member for sealing the space between said clamping plate and said border member, and latch means associated with said border member and adapted to cooperate with a jamb frame to exert force on the border member to press said border member toward the sealing surface on Said jamb frame.

16. A coke oven door of the selfsealing type adapted to be employed With a jamb frame located at an end of a horizontal coking chamber and having a rectangular opening therethrough which is surrounded by a flat sealing surface, said door comprising a frame shaped border member in the form of a rectangular loop having the 'conguration of the sealing surface on said jamb frame, the material of said loop `having a greater dimension in the direction between the inner and outer faces of the door than in the plane normal thereto,` a sealing edge element associated with said border member and having projecting from the face of said border member on the inner face of the door a relatively narrow sealing edge portionl extending completely around the door and adapted to engage the sealing surface on a door frame throughout the circumference of said surface, a clamping plate member lling the area surrounded by said border member, a flexible metal diaphragm extending between said clamping plate member and said border member and sealing the space between said members, means independent of said diaphragm for connecting said border and clamping plate members together so that one of said members is supported from the other of ysaid members, and latch means associated with said border member and adapted to cooperate withy a jamb frame to exert force on the border member to press said border member toward the sealing surface on said jamb frame.

17. A coke oven door of the self-sealing type adapted to be employed with a jamb frame located at the pusher end of a horizontal coking chamber and having a rectangular opening therethrough surrounded by a at sealing surface, said door comprisingV a rectangular frame shaped border member having the shape of the sealing surfacey on said jamb frame and having an Opening disposed therein surrounded by saidborder member, a clamping plate spaced from said border member and in alignment with said opening in said border member to partially close said opening, an opening in said clamping plate Y for a leveller bar,y a chuck door hingedly mounted to said border member and adapted to close said` leveller bar opening, a flexible metal sealing diaphragm having its peripherally outer edge secured to said border member and having itsperipherally inner edge secured to said clampingplate to permit lsaid border member to move relative said clamping plate and to complete the closing of said opening in said border member, a `sealing edge element secured to said border member and having projecting from the face of said border member at the inner face of said door a relatively narrow-edge portion extending completely around said door and adapted to engage the sealing surface on a jamb frame throughout the circumference of said surface, and means associated with said border member and adapted to cooperate with a jamb frame to exert force on `said sealing edge on said border member to press said border member toward the sealing surface' on said jamb frame. Y

18. A coke oven door of the self-sealing type adapted to be employed with a jamb frame located at an end of a horizontal cokingchamber and having a rectangular opening therethrough surrounded by a flat sealing surface, said door comprising a `rectangular frame shaped border member having the shape of the sealing surface on said jamb frame and having an opening disposed therein surrounded by said border member, a clamping plate spaced from said border member and in alignment with said opening in said border member to partially close said opening, a exible metal sealing diaphragm having its peripherally outer edge secured to said border member and having its peripherally inner edge secured to said clamping plate to permit said border member to move relative said clamping plate and to complete the closing of said border member opening, a Sealing edge element secured to said border member and having projecting from the face of said border member at the inner face of said doo-r a relatively narrow edge portion which extends completely around said door and is adapted to engage the sealing surface on` a jamb frame throughout the circumference of said surface, and spring type latch means associated with said border member and adapted to cooperate with a jamb frame to exert resilient force on the border member toresiliently press said sealing edge on said border member toward the sealing surface on said jamb frame.

References Cited in the file of this patent UNITED STATES PATENTS 1,257,113 Plantinga Feb. 19, 1918 2,157,569 Potter May 9, 1939 2,197,943 Potter Apr. 23, 1940 2,207,562 Van Ackeren ,uly 9, 1940 2,209,590 Wilputte July 30, 1940 2,235,686 Potter Mar. 18, 1941 2,23 6,092 Freeman Mar. 25, 1941 2,238,239 Wlputte Apr. 15, 1941 FOREIGN PATENTS 563,286 Germany Mar. 2, 1934 

1. A COKE OVEN DOOR OF THE SELF-SEALING TYPE ADAPTED TO BE EMPLOYED WITH A JAMB FRAME, LOCATED AT AN END OF A HORIZONTAL COKING CHAMBER, HAVING A RECTANGUALR OPENING THERETHROUGH SURROUNDED BY A FLAT SEALING SURFACE, SAID DOOR COMPRISING A RECTANGULAR FRAME SHAPED BORDER MEMBER HAVING THE SHAPED OF THE SEALING SURFACE ON SAID JAMB FRAME AND HAVING AN OPENING DISPOSED THEREIN SURROUNDED BY SAID BORDER MEMBER, A CLAMPING PLATE SPACED FROM SAID BORDER MEMBER AND IN ALIGNMENT WITH SAID OPENING IN SAID BORDER MEMBER TO PARTIALLY CLOSE SAID OPENING,A FLUXIBLE METAL SEALING DIAPHRAGM HAVING ITS PERIPHERALLY OUTER EDGE SECURED TO SAID BORDER MEMBER AND HAVING ITS PERIPHERALLY INNER EDGE SECURED TO SAID CLAMPING PLATE TO PERMIT SAID BORDER MEMBER TO MOVE RELATIVE SAID CLAMPING PLATE AND TO COMPLETE THE CLOSING OG SAID OPENING, A SEALING EDGE ELEMENT SECURED TO SAID BORDER MEMBER AND HAVING PROJECTING FROM THE FACE OF SAID BORDER MEMBER AT THE INNER FACE OF SAID DOOR A RELATIVELY NARROW EDGE PORTION EXTENDING COMPLETELY AROUND SAID DOOR AND ADAPTED TO ENGAGE THE SEALING SURFACE ON A JAMB FRAME THROUGHOUT THE CIRCUMFERENCE OF THE SAID SURFACE, AND MEANS ASSOCIATED WITH SAID BORDER MEMBER AND ADAPTED TO COOPERATE WITH A JAMB FRAME TO EXERT FORCE ON THE BORDER MEMBER SEALING EDGE ON SAID BORDER MEMBER TOWARDS THE SEALING SURFACE ON SAID JAMB FRAME. 